Hi @Patribus ,
Bing Maps imagery is a patchwork, stitched together like a quilt, of imagery from multiple providers. You have removed the attribution from your capture above but in the bottom corner you can usually find the supplier. There is often a tough judgement call in choosing fresher imagery that has less resolution and supporting higher resolution in urban environments over rural. This is why you will see varying imagery density in different regions. Also some areas of the world just don't have a higher resolution fly over data available for many different reasons. The imagery team partners to offer the best that we can get, balancing the costs, storage requirements and choices available. For your part, you can click the feedback button and fill in why you need higher resolution imagery in that area or even reach out to a supplier like https://www.terracolor.net/ if you need something specific.
Sincerely,
IoTGirl